Water closet tank



FIG. 1 is a perspective view taken from the top, front and left side of a water closet tank showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof; the right side being a mirror image of the left side;

FIG. 4 is a front elevational view thereof; and

FIG. 5 is a bottom plan view thereof.

The fragmentary broken line representations of fitting holes in FIG. 5 are for the purpose of illustration only and forms no part of the claimed design. 

The ornamental design for a water closet tank, as shown and described. 